A display panel and display device

Abstract

The application discloses a display panel and a display device, which comprise a first substrate, a second substrate, a liquid crystal layer and a liquid crystal alignment film; the first substrate and the second substrate are oppositely arranged; the liquid crystal layer is located between the first substrate and the second substrate; the liquid crystal alignment film is located on one side of the first substrate and / or the second substrate facing the liquid crystal layer; the material of the liquid crystal alignment film comprises a low-blue-light material, among the blue light irradiated onto the liquid crystal alignment film, the transmittance of the blue light located in a first preset wavelength range is less than the transmittance of the blue light located in a second preset wavelength range, and the first preset wavelength range and the second preset wavelength range do not overlap. The application can effectively reduce the proportion of harmful blue light on the light-emitting side of the display panel, and realize a low-blue-light protection effect.

Description

Technical Field

[0001] The present application relates to the field of display technology, and in particular to a display panel and a display device. Background Art

[0002] Currently, low-blue light technology is a key development direction in the display panel industry. This is because the light emitted by the backlight system of liquid crystal displays (LCDs) contains harmful blue light, which is extremely harmful to the human body. Harmful blue light has high energy and can break down oxygen to produce free radicals, which can damage vision and cause eye diseases. By reducing the proportion of harmful blue light, the effectiveness of low-blue light protection can be achieved. Summary of the Invention

[0003] The present application provides a display panel and a display device, which can effectively reduce the proportion of harmful blue light on the light-emitting side of the display panel and achieve a low blue light protection effect.

[0004] The present application provides a display panel, comprising:

[0005] a first substrate;

[0006] a second substrate, disposed opposite to the first substrate;

[0007] a liquid crystal layer, located between the first substrate and the second substrate;

[0008] A liquid crystal alignment film is located on the side of the first substrate and / or the second substrate facing the liquid crystal layer; the material of the liquid crystal alignment film includes a low-blue light material, and the transmittance of blue light within a first preset wavelength range of blue light irradiated onto the liquid crystal alignment film is lower than the transmittance of blue light within a second preset wavelength range, and the first preset wavelength range and the second preset wavelength range do not overlap.

[0009] Optionally, the low blue light material includes at least one of a photoluminescent material and a blue light absorbing material; the photoluminescent material is selected from at least one of rare earth fluorescent materials, organic small molecule luminescent materials, organic metal complex luminescent materials, organic polymer luminescent materials and quantum dot materials; the blue light absorbing material is selected from at least one of salicylates, benzophenones, benzotriazoles, substituted acrylonitriles, triazines and hindered amine compounds.

[0010] Optionally, the rare earth fluorescent material includes aluminate phosphor or silicate phosphor, the organic small molecule luminescent material includes coumarin derivatives, the organic metal complex luminescent material includes a metal complex of a quinoline derivative, the organic polymer luminescent material includes polyphenylene ethylene or polypyrrole, and the quantum dot material includes zinc oxide or cadmium sulfide.

[0011] Optionally, the photoluminescent material is selected from 6,7-dihydroxycoumarin-3-carboxylic acid, and the blue light absorbing material is selected from 2-(2'-hydroxy-5'-methylphenyl)benzotriazole.

[0012] Optionally, the mass fraction of the low blue light material in the liquid crystal alignment film is greater than or equal to 0.1% and less than or equal to 0.5%.

[0013] Optionally, the first preset wavelength is greater than or equal to 415 nanometers and less than or equal to 455 nanometers.

[0014] Optionally, the low blue light material is the photoluminescent material, and the second preset wavelength is greater than 455 nanometers and less than or equal to 500 nanometers.

[0015] Optionally, the display panel further includes a blue light reflecting layer, the liquid crystal alignment film includes a light incident side and a light emitting side relatively arranged, and the blue light reflecting layer is located on the light incident side or the light emitting side of the liquid crystal alignment film; the material of the blue light reflecting layer includes nano metal oxide.

[0016] Optionally, the blue light reflecting layer includes a plurality of first sub-film layers and second sub-film layers alternately stacked, and the refractive index of the first sub-film layer is different from the refractive index of the second sub-film layer; the material of the first sub-film layer and the second sub-film layer includes any one or more of indium oxide, tin oxide, zirconium dioxide, titanium dioxide, titanium trioxide, holmium trioxide, antimony trioxide and antimony pentoxide.

[0017] The present application also provides a display device, comprising a backlight module and the above-mentioned display panel, wherein the backlight module is located on the backlight side of the display panel.

[0018] The display panel and display device provided by the present application can reduce the transmittance of harmful blue light by adding a low-blue light material to the liquid crystal alignment film of the display panel, thereby effectively reducing the proportion of harmful blue light on the light-emitting side of the display panel and achieving a low-blue light protection effect. At the same time, adding a low-blue light material with the function of reducing harmful blue light to the liquid crystal alignment film will not affect the overall thickness of the display panel, which is conducive to achieving a lightweight and thin design of the display device. Moreover, the liquid crystal alignment film added with the low-blue light material is suitable for existing production processes and production equipment, and will not increase production costs. Therefore, the present application can effectively reduce the proportion of harmful blue light on the light-emitting side of the display panel without increasing the thickness of the display panel and the production cost, thereby achieving a low-blue light protection effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The following detailed description of the specific embodiments of the present application in conjunction with the accompanying drawings will make the technical solutions and other beneficial effects of the present application apparent.

[0020] Figure 1 A schematic diagram of the cross-sectional structure of a display panel provided in an embodiment of the present application.

[0021] Figure 2 The blue light spectra of the liquid crystal alignment film without adding low blue light material and the liquid crystal alignment film with adding low blue light material are shown in FIG.

[0022] Figure 3 A schematic cross-sectional structure diagram of another display panel provided in an embodiment of the present application.

[0023] Figure 4 A schematic cross-sectional view of a display device provided in an embodiment of the present application. DETAILED DESCRIPTION

[0024] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the embodiments described are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without making creative efforts are within the scope of protection of this application.

[0025] In the description of this application, the terms "first" and "second" are used for descriptive purposes only and should not be understood to indicate or imply relative importance or implicitly specify the number of the technical features indicated. Therefore, a feature specified as "first" or "second" may explicitly or implicitly include one or more of the described features. In the description of this application, "plurality" means two or more, unless otherwise specifically specified.

[0026] In this application, unless otherwise expressly specified or limited, a first feature being "above" or "below" a second feature may include the first and second features being in direct contact, or may include the first and second features being in contact not directly but through another feature between them. Moreover, a first feature being "above," "above," and "above" a second feature may include the first feature being directly above or obliquely above the second feature, or may simply mean that the first feature is higher in level than the second feature. A first feature being "below," "below," and "below" a second feature may include the first feature being directly below or obliquely below the second feature, or may simply mean that the first feature is lower in level than the second feature.

[0027] The disclosure that follows provides many different embodiments, or examples, for implementing different structures of the application. For the purpose of simplicity, the elements and settings of the particular examples below are described in some instances by reference to only a few of the many different embodiments of the application. In no way should the application be limited to the examples described. The examples arc provided to illustrate the application and to develop an understanding of the many embodiments of the application. Each example describes a selective aspect of the application. For the sake of clarity, the description will not list every possible example, as those of ordinary skill in the art will understand that many examples can be made and used. Further, the application will be described in reference to different implementations of various components and settings. Of course, a person of ordinary skill in the art will comprehend that any number of variations and permutations of the parts and settings can be used.

[0028] The application provides a display panel, comprising a first substrate, a second substrate, a liquid crystal layer and a liquid crystal alignment film; wherein the first substrate and the second substrate are oppositely arranged, and the liquid crystal layer is located between the first substrate and the second substrate; the liquid crystal alignment film is located on the side of the first substrate and / or the second substrate facing the liquid crystal layer; the material of the liquid crystal alignment film comprises a liquid crystal alignment material and a low-blue-light material, among the blue light irradiated onto the liquid crystal alignment film, the transmittance of the blue light located in a first preset wavelength range is less than the transmittance of the blue light located in a second preset wavelength range, and the first preset wavelength range and the second preset wavelength range do not overlap.

[0029] It should be noted that the blue light in the first preset wavelength range is harmful blue light, and the low-blue-light material is configured to reduce the transmittance of the harmful blue light in the first preset wavelength range.

[0030] Specifically, the low-blue-light material comprises at least one of a photoluminescent material and a blue light absorbing material. Wherein the photoluminescent material is configured to red shift the main wavelength of the harmful blue light, and the blue light absorbing material is configured to absorb the harmful blue light.

[0031] Specifically, the function of the photoluminescent material is to red shift the main wavelength of the harmful blue light incident on the liquid crystal alignment layer through light conversion, thereby reducing the transmittance of the harmful blue light in the liquid crystal alignment layer. The function of the blue light absorbing material is to reduce the transmittance of the harmful blue light in the liquid crystal alignment layer by absorbing the harmful blue light incident on the liquid crystal alignment layer.

[0032] It can be understood that in the display panel provided by the application, the liquid crystal alignment film described above can be arranged on both the first substrate and the second substrate, or only on the first substrate or the second substrate, and the application does not limit this.

[0033] In the embodiments of the present application, by adding a low-blue-light material in the liquid crystal alignment film of the display panel, the transmittance of harmful blue light can be reduced, thereby effectively reducing the proportion of harmful blue light on the light-emitting side of the display panel, and realizing the low-blue-light protection effect. At the same time, adding a low-blue-light material with the function of reducing harmful blue light in the liquid crystal alignment film will not affect the overall thickness of the display panel, and is conducive to realizing the lightweight design of the display device. Therefore, the present application can effectively reduce the proportion of harmful blue light on the light-emitting side of the display panel without increasing the thickness of the display panel, and realize the low-blue-light protection effect.

[0034] The embodiments of the present application will be described in detail below with the liquid crystal alignment film described above arranged on the first substrate and the second substrate as an example.

[0035] As shown in the drawings, Figure 1 The embodiments of the present application provide a display panel 1, which includes a first substrate 2, a second substrate 3, a liquid crystal layer 4, a first liquid crystal alignment film 5 and a second liquid crystal alignment film 6; wherein the first substrate 2 and the second substrate 3 are arranged oppositely, and the liquid crystal layer 4 is located between the first substrate 2 and the second substrate 3; the first liquid crystal alignment film 5 is located on the side of the first substrate 2 facing the liquid crystal layer 4, and the second liquid crystal alignment film 6 is located on the side of the second substrate 3 facing the liquid crystal layer 4; the materials of the first liquid crystal alignment film 5 and the second liquid crystal alignment film 6 both include liquid crystal alignment material and low-blue-light material, among the blue light irradiated onto the liquid crystal alignment film 6, the transmittance of the blue light located in the first preset wavelength range is less than the transmittance of the blue light located in the second preset wavelength range, and the first preset wavelength range and the second preset wavelength range do not overlap.

[0036] It should be noted that the blue light in the first preset wavelength range is harmful blue light, and the low-blue-light material is configured to reduce the transmittance of the harmful blue light in the first preset wavelength range.

[0037] In a specific embodiment, the first preset wavelength is greater than or equal to 415 nanometers (nm) and less than or equal to 455 nm, in other words, the wavelength range of the harmful blue light described above is 415 nm to 455 nm.

[0038] Specifically, the first substrate 2 is an array substrate, and the second substrate 3 is a color filter substrate or a counter substrate. When the second substrate 3 is a color filter substrate, the color filter 21 is arranged in the color filter substrate; when the second substrate 3 is a counter substrate, the color filter 21 is arranged in the array substrate.

[0039] The embodiments of the present application will be described with the first substrate 2 as an array substrate and the second substrate 3 as a color filter substrate as an example.

[0040] In a specific embodiment, the first substrate 2 includes a first polarizer 7, a first base substrate 8, a driving circuit layer 9, a pixel electrode 10, a passivation layer 11, an array substrate side organic film (Polymer Film on Array, PFA) 12 and a first common electrode 13 stacked in sequence.

[0041] The drive circuit layer 9 includes a gate electrode 14 disposed on the side of the first base substrate 8 facing away from the first polarizer 7, a gate insulating layer 15 covering the gate electrode 14 and the first base substrate 8, an active layer 16 located on the gate insulating layer 15 and aligned with the gate electrode 14, and a source electrode 17 and a drain electrode 18 disposed on opposite sides of the active layer 16 and electrically connected to the active layer 16. The pixel electrode 10 is located on the gate insulating layer 15, disposed on the same layer as the drain electrode 18, and electrically connected to each other. The passivation layer 11 covers the source electrode 17, the drain electrode 18, and the pixel electrode 10, and the array substrate-side organic film 12 covers the passivation layer 11. The first common electrode 13 is located on the array substrate-side organic film 12.

[0042] Specifically, the first liquid crystal alignment film 5 covers the organic film 12 on the array substrate side and the first common electrode 13 , and the liquid crystal layer 4 is located on a side of the first liquid crystal alignment film 5 away from the first common electrode 13 .

[0043] In one specific embodiment, the second substrate 3 includes a second polarizer 19, a second base substrate 20, a color filter 21, a protective film (OC) 22, and a second common electrode 23, which are stacked in sequence. The color filter 21 includes a black matrix (BM) 24 and color resists 25 located on the side of the second polarizer 19 facing the first substrate 2. The protective film 22 covers the black matrix 24 and the color resists 25. The second common electrode 23 is located on the side of the protective film 22 facing the first substrate 2.

[0044] Specifically, the second liquid crystal alignment film 6 covers the second common electrode 23 , and the liquid crystal layer 4 is located on a side of the second liquid crystal alignment film 6 away from the second common electrode 23 .

[0045] Specifically, the color resist 25 includes a red resist (R), a green resist (G), and a blue resist (B).

[0046] Specifically, the display panel 1 further includes photospacers (PS) 26 located between the first substrate 2 and the second substrate 3 .

[0047] It can be understood that the light-emitting side of the display panel 1 is the display side, and the light-emitting side specifically refers to the side of the second polarizer 19 facing away from the second base substrate 20 .

[0048] Specifically, the material of the first base substrate 8 and the second base substrate 20 includes glass, but is not limited thereto.

[0049] It should be noted that the embodiment of the present application focuses on the improvement of the liquid crystal alignment film and does not limit the specific type of display panel. Figure 1 The VA (Vertical Alignment) type display panel shown is only used as an example for description.

[0050] Specifically, the display panel 1 of the present application may also be an In-Plane Switching (IPS) or Fringe Field Switch (HFS) type display structure, but is not limited thereto.

[0051] Specifically, the low blue light material includes at least one of a photoluminescent material and a blue light absorbing material, wherein the photoluminescent material is configured to redshift the main wavelength of harmful blue light, and the blue light absorbing material is configured to absorb harmful blue light.

[0052] Specifically, the photoluminescent material and the blue light absorbing material reduce the transmittance of harmful blue light in the liquid crystal alignment layer by light conversion and light absorption, respectively.

[0053] Specifically, the photoluminescent material is selected from at least one of rare earth fluorescent materials, organic small molecule luminescent materials, organic metal complex luminescent materials, organic polymer luminescent materials and quantum dot materials.

[0054] In a specific embodiment, the rare earth fluorescent material includes aluminate phosphor or silicate phosphor, the organic small molecule luminescent material includes coumarin derivatives, the organic metal complex luminescent material includes a metal complex of quinoline derivatives, the organic polymer luminescent material includes polyphenylene ethylene or polypyrrole, and the quantum dot material includes zinc oxide or cadmium sulfide.

[0055] In one embodiment, the photoluminescent material is selected from 6,7-dihydroxycoumarin-3-carboxylic acid, the chemical structure of which is shown below:

[0056]

[0057] Specifically, the blue light absorbing material is selected from at least one of salicylates, benzophenones, benzotriazoles, substituted acrylonitriles, triazines and hindered amine compounds.

[0058] In one embodiment, the blue light absorbing material is selected from 2-(2'-hydroxy-5'-methylphenyl)benzotriazole, whose chemical structure is shown below:

[0059]

[0060] In a specific embodiment, the low blue light material is a photoluminescent material, which can convert harmful blue light within a first preset wavelength range irradiated on the first liquid crystal alignment film 5 and the second liquid crystal alignment film 6 into non-harmful blue light within a second preset wavelength range, thereby reducing the transmittance of harmful blue light on the first liquid crystal alignment film 5 and the second liquid crystal alignment film 6.

[0061] In one embodiment, the second predetermined wavelength is greater than 455 nm and less than or equal to 500 nm.

[0062] It can be understood that converting harmful blue light with a wavelength range of 415 nm to 455 nm into non-harmful blue light with a wavelength range of 455 nm to 500 nm is equivalent to red-shifting the main wavelength of the harmful blue light.

[0063] like Figure 2 As shown, the blue light spectrum of the liquid crystal alignment film without adding low blue light material is shown as curve A, and the blue light spectrum of the liquid crystal alignment film with adding low blue light material is shown as curve B. Figure 2 It can be seen that when the low-blue light material is not added to the liquid crystal alignment film, the dominant wavelength of blue light passing through the liquid crystal alignment film is 455nm, and all harmful blue light in the wavelength range of 415nm to 455nm can pass through the liquid crystal alignment film. When the low-blue light material is added to the liquid crystal alignment film, the dominant wavelength of blue light passing through the liquid crystal alignment film is 470nm, and only a small amount of harmful blue light in the wavelength range of 415nm to 455nm passes through the liquid crystal alignment film. This shows that the liquid crystal alignment film provided by the embodiment of the present application can significantly reduce the amount of harmful blue light in the wavelength range of 415nm to 455nm that passes through the liquid crystal alignment film.

[0064] Of course, in other embodiments, the photoluminescent material and the blue light absorbing material can be added to the first liquid crystal alignment film 5 and the second liquid crystal alignment film 6 at the same time; or, the blue light absorbing material can be added to the first liquid crystal alignment film 5 and the second liquid crystal alignment film 6 alone.

[0065] Specifically, the liquid crystal alignment materials in the first liquid crystal alignment film 5 and the second liquid crystal alignment film 6 may be the same or different.

[0066] In some embodiments, the mass fraction of the low-blue light material in the liquid crystal alignment film ranges from 0.1% to 0.5%. When the low-blue light material is added to both the first liquid crystal alignment film 5 and the second liquid crystal alignment film 6, the mass fraction of the low-blue light material in the first liquid crystal alignment film 5 ranges from 0.1% to 0.5%, and the mass fraction of the low-blue light material in the second liquid crystal alignment film 6 is greater than or equal to 0.1% and less than or equal to 0.5%.

[0067] In an embodiment, the mass fraction of the low-blue light material in the first liquid crystal alignment film 5 is 0.1%, 0.2%, 0.3%, 0.4%, or 0.5%, and the mass fraction of the low-blue light material in the second liquid crystal alignment film 6 is 0.1%, 0.2%, 0.3%, 0.4%, or 0.5%.

[0068] It can be understood that the role of the liquid crystal alignment film is to align the liquid crystal, and therefore the material of the liquid crystal alignment film has a greater impact on the image sticking (IS) performance of the LCD, directly affecting the display effect of the LCD. Image sticking is an important standard for evaluating the reliability of the LCD, and can be divided into alternating current (AC) image sticking and direct current (DC) image sticking according to the mechanism of image sticking. Generally, the image sticking caused by the pre-tilt angle shift of the panel before and after testing is called AC image sticking, and the image sticking caused by residual DC bias is called DC image sticking. Among them, the main reason for the formation of AC image sticking is the insufficient alignment ability of the liquid crystal alignment film, which causes the pre-tilt angle to change after the electric field is applied, resulting in an increase in transmittance and thus causing image sticking; and one of the reasons for the formation of DC image sticking is that there is a certain number of impurity ions in the liquid crystal cell, for example, the ion impurities in the liquid crystal cell move and become charged due to the influence of the electric charge during the long-term use of the LCD, resulting in the formation of alternating / direct bias electric field, thereby causing the display to appear inconsistent with the setting. As the film layer in direct contact with the liquid crystal layer, the material of the liquid crystal alignment film is crucial, and if the alignment ability of the liquid crystal alignment film is insufficient or too many impurity ions are released, it will cause IS phenomenon, thereby affecting the display effect.

[0069] When the low-blue light material is added to the liquid crystal alignment film, the low-blue light material is a component of the liquid crystal alignment film, and when the amount of the low-blue light material added is too large, it may affect the alignment ability of the liquid crystal alignment film, or cause impurity ions to be brought in or released, thereby causing IS phenomenon. Therefore, it is necessary to focus on the type and amount of the low-blue light material. The applicant has found through research that a material resistant to thermal decomposition and UV decomposition should be selected as the low-blue light material, and the amount of the low-blue light material should be controlled within 0.1% to 0.5% to avoid IS phenomenon. Therefore, by adding an appropriate amount of low-blue light material of a specific material to the liquid crystal alignment film, the display effect of the liquid crystal display panel can be improved while reducing the transmittance of harmful blue light.

[0070] In an embodiment, the liquid crystal alignment materials in the first liquid crystal alignment film 5 and the second liquid crystal alignment film 6 are the same and are selected from polyimide (PI), but are not limited thereto.

[0071] Specifically, when the liquid crystal alignment material is polyimide, the preparation process of the liquid crystal alignment film (eg, the first liquid crystal alignment film 5 and the second liquid crystal alignment film 6) includes the following steps:

[0072] Doping low blue light material into polyimide stock solution;

[0073] Diluting and filtering the polyimide stock solution doped with the low blue light material;

[0074] The diluted and filtered polyimide stock solution is subjected to film forming and alignment treatment to form a liquid crystal alignment film.

[0075] Specifically, the polyimide stock solution includes a mixture of dianhydride monomers and diamine monomers. Before the dilution process, the dianhydride monomers and diamine monomers undergo a polymerization reaction to form polyamic acid; during the film formation process, the polyamic acid is converted into polyimide by heating.

[0076] Specifically, the polyimide stock solution doped with the low-blue-light material is diluted to obtain a polyamic acid solution containing the low-blue-light material. The polyamic acid solution containing the low-blue-light material is then subjected to precision filtration and viscosity adjustment to form a polyamic acid alignment agent containing the low-blue-light material.

[0077] Specifically, the diluted and filtered polyimide stock solution is subjected to film-forming and alignment treatment, comprising the following steps:

[0078] Spin-coating a polyamic acid orientation agent containing a low blue light material onto a substrate and performing a pre-baking treatment to form a PI film containing a low blue light material;

[0079] The PI film containing the low blue light material is subjected to alignment and post-baking treatment to form a liquid crystal alignment film containing the low blue light material.

[0080] In one embodiment, the dianhydride monomer includes 1,2,3,4-cyclobutanetetracarboxylic dianhydride, but is not limited thereto.

[0081] In the experimental process, the material of the substrate includes indium tin oxide (ITO); in the panel manufacturing process, the substrate is the first substrate 2 or the second substrate 3.

[0082] In a specific embodiment, ultraviolet light is used to align the PI film containing the low blue light material, and this process is a photoalignment process.

[0083] It should be noted that the film formation process and alignment process of the PI film can be completed by conventional methods, and this application does not limit this. The above-mentioned production process is only used as an example to illustrate.

[0084] It is understandable that the liquid crystal alignment film provided by the embodiments of the present application is applicable to the existing production process of liquid crystal alignment films and display panel boxing process, and does not require improvements to existing production equipment, so it will not increase production costs. In addition, the present application directly adds an appropriate amount of low-blue light material to the stock solution of the liquid crystal alignment material, which will not affect the thickness and alignment performance of the liquid crystal alignment film, and therefore will not affect the overall thickness and display effect of the display panel or display device. Compared with the additional film layer provided inside the display panel or outside the display panel to reduce the transmittance of harmful blue light, the embodiments of the present application can reduce production costs and reduce the overall thickness of the display product.

[0085] In the embodiment of the present application, by adding a low-blue light material to the liquid crystal alignment film of the display panel 1, the transmittance of harmful blue light can be reduced, thereby effectively reducing the proportion of harmful blue light on the light-emitting side of the display panel 1, and achieving a low-blue light protection effect. At the same time, adding an appropriate amount of low-blue light material with the function of reducing harmful blue light to the liquid crystal alignment film will not affect the overall thickness and display effect of the display panel 1, which is conducive to achieving a lightweight design of the display device 28. Moreover, the liquid crystal alignment film with added low-blue light material is suitable for existing production processes and production equipment, and will not increase production costs. Therefore, the present application can effectively reduce the proportion of harmful blue light on the light-emitting side of the display panel 1 without increasing the thickness and production cost of the display panel 1, and without affecting the display effect, thereby achieving a low-blue light protection effect.

[0086] An embodiment of the present application further provides a display panel. Different from the aforementioned embodiment, the liquid crystal alignment film in the display panel only includes the first liquid crystal alignment film or the second liquid crystal alignment film described above.

[0087] It is understandable that when the alignment capability of the liquid crystal alignment film is large enough, the liquid crystal alignment film may be provided only on the first substrate side or the second substrate side, which is beneficial to further save production costs and material costs.

[0088] An embodiment of the present application also provides a display panel, which is different from the aforementioned embodiment in that the display panel further includes a blue light reflecting layer, the liquid crystal alignment film includes a light incident side and a light emitting side that are relatively arranged, and the blue light reflecting layer is located on the light incident side or the light emitting side of the liquid crystal alignment film; the material of the blue light reflecting layer includes nano-metal oxide, and the blue light reflecting layer is configured to reflect harmful blue light.

[0089] In one embodiment, Figure 3 As shown, the blue light reflecting layer 27 is arranged between the first liquid crystal alignment film 5 and the first common electrode 13, that is, the blue light reflecting layer 27 is located on the light incident side of the first liquid crystal alignment film 5; the material of the blue light reflecting layer 27 includes nano metal oxide, and the blue light reflecting layer 27 is configured to reflect harmful blue light.

[0090] It should be noted that the light incident side of the first liquid crystal alignment film 5 refers to the side of the first liquid crystal alignment film 5 facing the first common electrode 13 , and the light emitting side of the first liquid crystal alignment film 5 refers to the side of the first liquid crystal alignment film 5 away from the first common electrode 13 .

[0091] It should be noted that the blue light reflecting layer 27 provided in the embodiment of the present application can selectively reflect the above-mentioned harmful blue light without affecting the display brightness of the display panel.

[0092] In other embodiments, the blue light reflecting layer may be further disposed between the first liquid crystal alignment film and the liquid crystal layer, or between the second liquid crystal alignment film and the liquid crystal layer, or between the second liquid crystal alignment film and the second common electrode.

[0093] Of course, the blue light reflecting layer can also be provided on the backlight side or the light emitting side of the display panel.

[0094] It can be understood that the backlight side of the display panel refers to the side of the first polarizer facing away from the first base substrate.

[0095] Specifically, the blue light reflecting layer 27 includes a plurality of first sub-film layers and second sub-film layers alternately stacked and having different refractive indices; the materials of the first sub-film layers and the second sub-film layers include any one or more of indium oxide, tin oxide, zirconium dioxide, titanium dioxide, titanium trioxide, holmium trioxide, antimony trioxide and antimony pentoxide.

[0096] It can be understood that the materials of the first sub-film layer and the second sub-film layer are different.

[0097] In the embodiment of the present application, the blue light transmittance can be more effectively reduced by using the blue light reflecting layer 27 in conjunction with a liquid crystal alignment film capable of reducing the blue light transmittance.

[0098] like Figure 4 As shown, the embodiment of the present application further provides a display device 28, which includes a backlight module 29 and the display panel 1 or 1' described in any one of the above embodiments. The backlight module 29 is located on the backlight side of the display panel 1 or 1'.

[0099] Specifically, the light emitted by the backlight module 29 toward the display panel 1 or 1 ′ contains harmful blue light.

[0100] In a specific embodiment, the display device 28 can be a quantum dot liquid crystal display. Correspondingly, the display device 28 also includes a quantum dot light conversion layer arranged between the display panel 1 or 1' and the backlight module 29, and the light emitted by the backlight module 29 is blue light; the blue light emitted by the backlight module 29 can excite the quantum dot light conversion layer to emit red light and green light.

[0101] Of course, in other embodiments, the display device 28 may be other types of liquid crystal displays. As long as the backlight module 29 emits light containing the harmful blue light described in this application, it is within the scope of protection of this application.

[0102] In the embodiment of the present application, since the liquid crystal alignment film in the display panel 1 or 1' contains low blue light material, the proportion of harmful blue light on the light-emitting side of the display panel 1 or 1' can be effectively reduced, so that the user can effectively achieve a blue light protection effect when using the display device 28, thereby effectively protecting the user's eyesight.

[0103] In the above embodiments, the description of each embodiment has its own focus. For parts that are not described in detail in a certain embodiment, reference can be made to the relevant descriptions of other embodiments.

[0104] The above is a detailed introduction to a display panel and a display device provided in the embodiments of the present application. Specific examples are used herein to illustrate the principles and implementation methods of the present application. The description of the above embodiments is only used to help understand the technical solutions and core ideas of the present application. Ordinary technicians in this field should understand that they can still modify the technical solutions recorded in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. These modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present application.

Claims

1. A display panel, characterized in that: include: a first substrate; a second substrate, disposed opposite to the first substrate; a liquid crystal layer, located between the first substrate and the second substrate; a liquid crystal alignment film located on a side of the first substrate and / or the second substrate facing the liquid crystal layer; the liquid crystal alignment film is made of a low-blue light material, and among the blue light irradiated onto the liquid crystal alignment film, the transmittance of blue light within a first preset wavelength range is lower than the transmittance of blue light within a second preset wavelength range, and the first preset wavelength range and the second preset wavelength range do not overlap; The first preset wavelength is greater than or equal to 415 nanometers and less than or equal to 455 nanometers, and the second preset wavelength is greater than 455 nanometers and less than or equal to 500 nanometers; the low blue light material is a photoluminescent material, and the photoluminescent material is configured to convert blue light within the first preset wavelength range into blue light within the second preset wavelength range.

2. The display panel according to claim 1, wherein: The photoluminescent material is selected from at least one of rare earth fluorescent materials, organic small molecule luminescent materials, organic metal complex luminescent materials, organic polymer luminescent materials and quantum dot materials.

3. The display panel according to claim 2, wherein: The rare earth fluorescent material includes aluminate phosphor or silicate phosphor, the organic small molecule luminescent material includes coumarin derivatives, the organic metal complex luminescent material includes metal complexes of quinoline derivatives, the organic polymer luminescent material includes polyphenylene ethylene or polypyrrole, and the quantum dot material includes zinc oxide or cadmium sulfide.

4. The display panel according to claim 2, wherein: The photoluminescent material is selected from 6,7-dihydroxycoumarin-3-carboxylic acid.

5. The display panel according to any one of claims 1 to 4, characterized in that: The mass fraction of the low blue light material in the liquid crystal alignment film is greater than or equal to 0.1% and less than or equal to 0.5%.

6. The display panel according to claim 1, wherein: The display panel further includes a blue light reflecting layer, the liquid crystal alignment film includes a light incident side and a light exiting side arranged opposite to each other, the blue light reflecting layer is located on the light incident side or the light exiting side of the liquid crystal alignment film; the material of the blue light reflecting layer includes nano metal oxide.

7. The display panel according to claim 6, wherein: The blue light reflecting layer includes a plurality of first sub-film layers and second sub-film layers alternately stacked, and the refractive index of the first sub-film layer is different from the refractive index of the second sub-film layer; the materials of the first sub-film layer and the second sub-film layer include any one or more of indium oxide, tin oxide, zirconium dioxide, titanium dioxide, titanium trioxide, holmium trioxide, antimony trioxide and antimony pentoxide.

8. A display device, characterized in that: The device comprises a backlight module and a display panel according to any one of claims 1 to 7, wherein the backlight module is located on the backlight side of the display panel.

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